LZN or lzn may refer to: LZN, the IATA code for Nangan Airport, Matsu Islands, Taiwan lzn, the ISO 639-3 code for Leinong language, Burma
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0af16892ff26224a9cc2fc062b1f0e1732aad7d70fb4e16729680fcead2075. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb963f50-552d-4737-9b1b-408f721a2202.json and https://artists.proofprofile.net/proofs/artist/fb963f50-552d-4737-9b1b-408f721a2202.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).